Emerson PACSystems RX3i User Manual page 124

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
4.10.3.3.2 Energy Pack Replacement
If an Energy Pack fails, you can replace it while the CPU is in operation. Use a compatible
new unit or a compatible replacement Cap Pack. Whenever an Energy Pack is replaced,
the newly installed Cap Pack must build up its charge.
In the case of ACC402 attached to CPE330, the Energy Pack, when hot-swapped, draws
minimal current in order to recharge: it may therefore take up to 10 minutes for ACC402
to charge completely. This is normal operation. Similarly for ACC403/CPE400 and
ACC403/CPL410.
If a loss of power occurs while the Energy Pack is disconnected, or before the capacitors
are fully charged, memory loss may occur.
4.10.3.3.3 CPE330/ACC402 Status Detection & Fault Reporting
Both the CPE330 and ACC402 contain intelligence, allowing each to determine the status
of the other. This permits the CPU to report various conditions to the user via the status
bits discussed in Energy Pack Status Bit Operation.
Whenever the CPE330 detects any kind of issue with the ACC402 Energy Pack, it resumes
normal operation and issues warnings or faults to the user. The table below details the
various permutations possible at power-up. If the Cap Pack is removed during normal
operation, this fault will be reported as a failed battery fault.
Energy Pack
Not present
(removed or
Not present
(bad base)
(good base)
(good base)
(suspicious)
CPU Operation
Cap Pack
Base
Not present
(removed or
failed) failed)
Present
(good cap
pack)
Not present
Present
(removed or
failed)
Present
Present
(good cap
pack)
Present Present
(suspicious)
CPE330 power-up response
Detects missing ACC402 and boots up immediately
but does not use any stored memory when resuming
operations. Issues fail battery fault.
Detects missing ACC402 and boots up immediately
but does not use any stored memory when resuming
operations. Issues fail battery fault.
When the CPU does not see a fully charged status
within 90 seconds, it does not use any stored
memory when resuming operations. Issues fail
battery fault.
The CPU will wait for fully charged status within
timeout period and then resume operation using the
contents of memory retained at the previous loss of
power event
If the CPU does not see a fully charged status within
90 seconds, it does not use any stored memory when
resuming operations. Issues fail battery fault.
Section 4
October 2019
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